What is the primary component of an electric circuit?

• A. Capacitance
• B. Inductance
• C. Resistor
• D. Voltage source

Answer: (D)

In an electric circuit, the primary component is the voltage source because it provides the necessary electrical energy that drives the flow of current. Without a voltage source, there would be no potential difference to push the electrons through the circuit, rendering all other components ineffective.

The voltage source, such as a battery or power supply, establishes the electric field needed for current to flow. This flow of current is crucial for the functioning of other components within the circuit, such as resistors, capacitors, and inductors. Resistors, for example, regulate the current flow, while capacitors and inductors store and release energy, but none of these components can operate without the energy supplied by the voltage source.

In summary, the voltage source is fundamental to the operation of an electric circuit, serving as the driving force for current, which is necessary for any electronic device or system to function.